Fluid pump, turbine, and the like.



R. C. PARSONSr FLUID PUMP, TURBINE, AND THE LIKE.

APPLICATION FILED DEC. I8 I9I5.

Patented Jan. 22, 1918.

2 SHEETS-SHEET I.

R. C. PARS'ON'SJ" FLUID PUMP, TURBINE, AND THE LIKE.

APPLICATlON FILED DEC. ls, 1915. l 1,254,156. Patented Jan. 22,1918.

2 SHEETS-SHEET 2.

RICHARD c. rAnsoNs, or LoNnoN, ENGLAND.

FLUID PUMP, TURBINE, AND. THE LIKE.

nasales.

Specification of Letters Patent. y

Patented aan. ea, rais.

Application led December 18, 1915. Serial No. 67,521#

To all whom t may concern:

Be it known that T, The Honorable RICH- ARD CLERE PARSONS, M. A., M.InstfC. E., a'

subject of the King of Great Britain and lreland, and residing atLondon, S. W., England, have invented certain new and usefulImprovements in and Relating to Fluid Pumps, Turbines, and the like, ofwhich the following is a specilication.

This invention relates to improvements in centrifugal pumps, turbinetype fluid pumps, or water turbines, and the like, of the type in whichresilient blades are employed;

When centrifugal pumps, for example, are employed for pumping fluidcontaining sand or other abrasive matters, it is found that seriousabrasion of the internal parts takes place, with resulting greatreduction `of efficiency, besides giving rise to frequent and costlyrepairs; and when such pumps are used for pumping Huids containingfibrous matter or the like, such matter becomes wedged between theimpellerv and the surfaces against which it-revolves, frequently causingstoppage of the pump.

` The object of the present invention is to overcome these difculties.

The invention consists in an improved form of pump in which the vanes ofthe impeller are constructed entirely of resilient material thel faceagainst which it contacts also being constructed of resilient material,while the passages through which the fluid passes are of such form thatwith the vane resiliency solid, fibrous, andother matters will 'passthrough the pump readily and without blocking it.

1The invention also consists in the improved constructions of pumpshereinafter described.-

The invention is applicable to centrifugal umps' of any of the wellknown forms, having unshrouded impellers with either single or doubleinlet.

By the use of the resilient impellers, and suitable grooves vin thesurface ofthe casing against which they contact, according to theinvention, fibrous and the other solid matters are readily passedthrough the Owing to the resiliency of the aided by the grooves in theface of the casing, these are enabled to overrun any fibrous and betweenthem and the casing, the revolution 39 Victoriastreet,

' portion by bolts jblades are formed on the face of the impeller. The

other matters which may lodgeof the succeeding resilient blades givingsuccessive impulses to the lodged matter until it is finally 'expelledfrom the pump. The wear of the pump by sand or other abrasive matter isgreatly reduced by the use of the rubber or like coating, it having beenfound by experiment that` rubber of the quality specially selected is,under the conditions eX- isting, less liable to abrasion thanmetal.

-vReferring* to the accompanying drawings Figure 1 isa transversesection of one form of pump constructed according to the invention; p f

Figs. 2, 8 Vand a being similar views ofv modified forms.

Fig. 5 is a front view of the pump shown in Fig. l, the front portion ofthe` casing being removed. Fig. 6 is a view casing, as seen from theinterior of the pump, showing the grooves in the face.

Tn carrying the invention into eect, according to thefform shown inFig.y l, which represents a centrifugal pump of the single inlet type,the pump chamber is constructed of rtwo parts, a, respectively. The backportion a contains the bearing, which is lubricated with a stream ofwater, and also an air pipe for balancing purposes and in which worksthe spindle c carrying the impeller d., and attached to which is thenecessary thrust bearing. This part also contains the outer or volutechamber e of the pump, and the discharge pipe oroutlet f. The volutechamber e is closed at the front by the part b, which is connected tothe back passing through flanges on the two parts. The center of theportion?) of the pump is provided with a circular ap-z erture g, whichserves as the inlet. The impeller is constructed in the following mannerz-The center is constructed of metal which is suitably attached to thespindle upon which it revolves.l The front face of this metalis'provided. with deep grooves, following the line of the usual impellerblades, and by the use of a suitable mold impeller hof the usual shape,but of rubber,

rubber is arranged to fill the grooves in the front face of theimpeller, these grooves being preferably of dovetail form, so as tosecure the rubber to the metal, and preferably considerably wider thanthe thickness of the blades, so that a heavy rubber root is of the frontportion of the formed, so as toy allow bending of the impeller bladeswithout overstressing. The

rubber of which these vanes. are formed is facel of the part b adjacentto the impeller blades, these grooves being of the form illustrated inFig. 6, and continued some distance along the inlet pipe g. Thesegrooves assist in the removal of solid particles which are swept intothe grooves and then along them toward the circumference by the rotationof the impeller blades.

In the form of the invention illustrated in Fig. 2, which is suitablefor pumping fluids containing abrasive material, the back cas# ing ofthe pump a contains only one half of the volute chamber e, and of theoutlet pipe f, theA other half of each of these being formedv by thefront portion Z, so that these twopo'i'tions of the front consist ofsimple castings With-out cores. The central opening of the part Z of thecasing is of slightly greater diameteil than the impeller d, so that thelatter can be 'withdrawn through it.

This .opening is closed inby Aa casting b having a central inlet g. Thewhole of the interior surface of these parts, and the front and rearsurfaces and circumference of the impeller, are so arranged that theycan be easily rubbered over such area as may be required for any specialduty, the rubber m being simply molded onto the several parts, asillustrated. The vanes for balancing purposesat the back of the impellermay also be made of rubber if desired.

In therform, of the invention shown in Fig. 3,'which is speciallysuitable for pumps 'employed in dredging, and in some mining operations,such as pumping slimcs and tailings, where the wear on the pumps is verygreat, a secondary chamber or lining n, o, may be provided inside theouter casing of the pump, specially designed to easily receive therubber facing and constructed so.

that Vit can be easily removed and re-rubbered. Y

Another form of such a separate casing is shown at lIig. 4, the casinghere being constructed in two parts, o and m, which are lining, saidneemt@ arranged to contain the volute chamber e. The portion of oagainst which the impeller contacts contains grooves similar to thoseal-v ready described. y

In this form of the invention, the parts n, o, forming the pump chamberare mounted inside a second chamber formed bythe two parts a, b, thepart of the second chamber a carrying the impeller bearings. The back ofthe propeller is provided with balancing vanes g, which rotate in thechamber formed at the back of the propeller between the two parts n ando. The inner chamber e is of the usual spiral form, and has all itsinner surfaces forming the fluid passages lined with rubber vulcanizedon to the two parts n, o. The delivery orifice of the pum spiral isopposite a continuation brano with an outside flange formed on the outerchamber, the inner chamber being bolted I claim as new and desire tosecure by Letters Patent is l 1. A centrifugal pump comprising incombination a casin a resilient lining completely covering t einnersurfac'e of said casing, an impeller including a rotating disk andvanes made entirely of resilient material carried on the side of saiddisk, as and for the purposes described. v

2. A centrifugal pump comprising in combination a casing, a resilientlining completly covering the inner surface of said casing, grooves inthe face of said resilient grooves being in the direction of iiow of theuid through the pump, an impeller including a rotating disk and vanesmade 'entirely of resilient material carried on the side of said disk,as and for the purposes described.

In testimony whereof I have signed my name to this specication.

R. C. PARSNS.

